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#!/bin/bash
# allow settings to be updated via environment
: "${xvfb_lockdir:=$HOME/.xvfb-locks}"
: "${xvfb_display_min:=99}"
: "${xvfb_display_max:=599}"
# assuming only one user will use this, let's put the locks in our own home directory
# avoids vulnerability to symlink attacks.
mkdir -p -- "$xvfb_lockdir" || exit
i=$xvfb_display_min # minimum display number
while (( i < xvfb_display_max )); do
if [ -f "/tmp/.X$i-lock" ]; then # still avoid an obvious open display
(( ++i )); continue
fi
exec 5>"$xvfb_lockdir/$i" || continue # open a lockfile
if flock -x -n 5; then # try to lock it
exec xvfb-run --server-num="$i" "$@" || exit # if locked, run xvfb-run
fi
(( i++ ))
done
# Fail if we did not found any display left, and thus did not executed the test
exit 1
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